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Question: A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibra...

A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is -

A

4 RT

B

15 RT

C

9 RT

D

11 RT

Answer

11 RT

Explanation

Solution

ΔU(ΔQ)p\frac{\Delta U}{(\Delta Q)_{p}}= nCVΔTnCp.ΔT\frac{nC_{V}\Delta T}{nCp.\Delta T}= CVCp\frac{C_{V}}{Cp}= 57\frac{5}{7}